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汶川地震后,震中地区地表形态遭到很大破坏.在该地区开展科学研究急需高精度数字高程模型支持,重建震区数字高程模型十分必要.本文以高精度重建该地区数字高程模型为目标,综合ALOS PRISM获取的三轨立体像对、ALOS PALSAR雷达影像和欧空局发布的汶川地震ENVISAT雷达影像等资料,采用光学遥感立体测图技术、InSAR技术,并融合已有全球数字高程模型,研究建立覆盖此地区15m分辨率的数字高程模型.在利用中国地壳运动监测网络和陆态网络工程项目实测的GPS数据进行高程精度分析后表明:ALOS PRISM DEM精度优于10 m(95％置信度);ALOS PALSAR DEM精度优于10 m(95％置信度),而ENVSAT ASAR DEM在平原、丘陵地区精度优于20 m(95％置信度).研究证明:ALOS PRISM能进行高精度的地形测量,ALOS PALSAR在山区仍可获得高精度数字高程模型,ENVISAT ASAR在平原地区的精度较高.因此融合光学、雷达遥感技术完全满足获取高精度、高分辨率震区数字高程模型的需要,这为在困难地区建立高精度数字高程模型提供了一个很好的途径. 相似文献
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《Geodinamica Acta》2013,26(1-3):65-78
This paper discusses the interpretation of ground motions detected in the dried up Lynch Strait, Dead Sea area, by applying radar interferometric techniques to ALOS Palsar Synthetic Aperture Radar images. Four ALOS scenes spanning from December 15, 2007 to May 17, 2008 have been processed leading to the generation of five interferograms. Three ground deformation zones have been detected. One of them shows surface displacement which could be related to an earthquake (ML 3.1) that took place on April 13, 2008. High rates of subsidence have been measured in the northern Lynch Strait. They suggest that these subsidence phenomena follow the same trend of rapid increase as sinkholes. Additional measurements should be carried out in order to refine this observation. The comparison between sinkholes' distributions in the Lynch Strait with that of Ghor Al Haditha, six kilometers eastward, supports the idea that the earthquake that hit the southern Dead Sea on April 23, 1979 (M 5.1) reactivated faults and fractures in the Lynch Strait triggering the development of sinkholes and subsidence in the frame of the Dead Sea recession. 相似文献
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